D21H 17/56
Polyamines
Official title: Polyamines; Polyimines; Polyester-imides
D21H17/56 (Polyamines) appears on 278 US grants and 258 published applications in this corpus.
Search patents in D21H- Granted patents
- 278
- Published applications
- 258
- Assignees
- 150
- Inventors
- 725
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 9 | 0 |
| 1998 | 8 | 0 |
| 1999 | 7 | 0 |
| 2000 | 10 | 0 |
| 2001 | 10 | 3 |
| 2002 | 8 | 8 |
| 2003 | 7 | 8 |
| 2004 | 11 | 7 |
| 2005 | 5 | 10 |
| 2006 | 1 | 9 |
| 2007 | 4 | 9 |
| 2008 | 2 | 10 |
| 2009 | 2 | 17 |
| 2010 | 4 | 11 |
| 2011 | 11 | 15 |
| 2012 | 8 | 7 |
| 2013 | 10 | 11 |
| 2014 | 9 | 11 |
| 2015 | 15 | 25 |
| 2016 | 6 | 11 |
| 2017 | 21 | 16 |
| 2018 | 14 | 14 |
| 2019 | 10 | 7 |
| 2020 | 11 | 8 |
| 2021 | 5 | 8 |
| 2022 | 8 | 7 |
| 2023 | 2 | 4 |
| 2024 | 7 | 9 |
| 2025 | 3 | 4 |
| 2026 | 5 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Foam-assisted application of uncooked starch and dry strength agents to paper products8 Sep 2026US 12,729,486 B2Solenis Technologies, L.P.
- Composition for improving softness of tissue and/or towel products12 May 2026US 12,624,503 B2Solenis Technologies, L.P.
- Non-cationic softeners and methods of use14 Apr 2026US 12,600,924 B2Ecolab USA Inc.
- Wet laid paper and paperboard products with high wet strength and method of making the same27 Jan 2026US 12,534,854 B2First Quality Tissue, LLC
- Cellulose composition13 Jan 2026US 12,522,980 B2Kemira Oyj
- Polyimide fibre paper1 Oct 2026US 2026/0297851 A1Dupont Electronics, Inc.
- Composition13 Aug 2026US 2026/0234871 A1Daikin Industries, Ltd.
- Water soluble amphoteric emulsion terpolymers, methods of making, and methods of use as retention and dewatering aids30 Jul 2026US 2026/0218455 A1
- Surface-modified fibers, method for producing same, and molded article using surface-modified fibers23 Jul 2026US 2026/0210032 A1Kuraray Co., Ltd.
- Stretchable paper23 Jul 2026US 2026/0210057 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Production of paper and paperboard198US 4,753,710 AAllied Colloids Limited · 1988
- Wet wipe122US 5,292,581 AThe Dexter Corporation · 1994
- Production of paper and paper board121US 4,913,775 AAllied Colloids Limited · 1990
- Paper and paper-like products including water insoluble fibrous carboxyalkyl cellulose90US 5,667,637 AWeyerhaeuser Company · 1997
- Production of paper and cardboard83US 4,749,444 ABASF SE · 1988